I Bought a built but never ran stroker motor off a old guy that wanted to off load it cheap due to health problems. Ivw never had anything to do with modified stroker VW engines and wasnt confident he built it properly. I'm just after some advice on it configuration
79.2mm stroke 2" Chevy journal Crank
6" Pauter Buick Rods
88mm thick wall barrels and pistons
Engle 100 crank
Autolinea Heads with 40mm / 35.5mm valves
1:25 ratio rockers
Apparently 1927cc and the engine has an extra 42mm extra width overall. Is it possible to run shorter rods to bring the engine width back close to normal?
Not sure on compression set up.
Stroker engine build help
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Morgo1122
- Posts: 1
- Joined: Mon Jul 19, 2021 11:53 pm
Stroker engine build help
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jsturtlebuggy
- Posts: 51
- Joined: Tue Jun 11, 2013 7:19 pm
Re: Stroker engine build help
Looks like someone may have did a offset grind of rod journals to come up with a 79.2 stroke Chevy/Buick size.
Yes you could use shorter rods to make engine narrower. The shortest ones I now of are 5.325in. There is also 5.394, 5.400, 5.500,5.600 in are just some common lengths found.
I am using the 5.325in rod with 82mm stroke crank in a 2275cc engine I have. Which is a 1.65 rod ratio.
Rod ratio is something that many have different opinions on what is correct,
Stock VW 1600cc engine with 69mm stroke and a 137mm (5.394in) rod length is 1.98 ratio.
With what you have ratio is 1.92 ratio.
Simple explanation is short rod works at lower RPMs, long rods more horsepower at higher RPMs.
Yes you could use shorter rods to make engine narrower. The shortest ones I now of are 5.325in. There is also 5.394, 5.400, 5.500,5.600 in are just some common lengths found.
I am using the 5.325in rod with 82mm stroke crank in a 2275cc engine I have. Which is a 1.65 rod ratio.
Rod ratio is something that many have different opinions on what is correct,
Stock VW 1600cc engine with 69mm stroke and a 137mm (5.394in) rod length is 1.98 ratio.
With what you have ratio is 1.92 ratio.
Simple explanation is short rod works at lower RPMs, long rods more horsepower at higher RPMs.
Joseph
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slayer61
- Posts: 131
- Joined: Wed Jul 14, 2021 10:32 am
Re: Stroker engine build help
A long rod is ALWAYS better than a short rod... right up until you run out of physical space to mount the engine.
Picture a standard VW stroke of 69mm. Imagine that crankshaft had a 1000mm rod connected to it. It would apply almost ZERO side force into the piston.
Now, put that same crankshaft onto a 50mm connecting rod. The side loads on the piston would be very high.
Of course this doesn't take into account rotating mass......
Picture a standard VW stroke of 69mm. Imagine that crankshaft had a 1000mm rod connected to it. It would apply almost ZERO side force into the piston.
Now, put that same crankshaft onto a 50mm connecting rod. The side loads on the piston would be very high.
Of course this doesn't take into account rotating mass......
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jsturtlebuggy
- Posts: 51
- Joined: Tue Jun 11, 2013 7:19 pm
Re: Stroker engine build help
Can you tell us what else is in engine, what cam did it come with? Cylinder heads, brand, are valves larger then stock?
Carburetors? Exhaust size?
What kind of vehicle is it going in, and what does vehicle weigh?
Daily driver or racer?
Carburetors? Exhaust size?
What kind of vehicle is it going in, and what does vehicle weigh?
Daily driver or racer?
Joseph